I had the same experience, some internal recruiter reaching out that they were super impressed and wanted me for some special group, then a phone call where the

I had the same experience, some internal recruiter reaching out that they were super impressed and wanted me for some special group, then a phone call where they never bothered to show up(!) so we rescheduled, then some stupid interview where they asked me to estimate the value of 2^10 or something and then told me they didn't want me for the special group after all. Complete waste of time, especially given I didn't really even want the job, they reached out to me. Taught me a lesson, at least: I'll never work at a big company, no salary is worth that kind of treatment of other people.